This is a fragment from the Mausoleum, one of the Seven Wonders of the Ancient
World. This is the "original" Mausoleum, built for King Mausollos of Caria,
from which we get the word that has
come to be used for any large tomb.
Again, this is not a "Greek" structure, precisely. It was located in the
western part of Asia Minor (modern day Turkey). However, Greek sculptors were
employed to create the sculptures.
You can read more about the
Hopefully this picture allows you to determine the scale of this piece. That's
a staircase behind it.